@Chezzy SSJ4
Hidan winning doesn't mean Asuma is weaker. Kakashi didn't beat Kakazu multiple times. In fact similar to Asuma without Shikamaru both didn't accomplish no proper injuries. Rather it was Hidan or Kakazu.
Asuma decapitated Hidan because Shikamaru
Kakashi pierced Kakazu because Shikamaru's opening. I get he countered Lightning and avoided wind mask but Asuma would be fine in both scenarios. Kakazu also blitz Kakashi twice once Shikamaru left.